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Effect of transition metal oxides catalysts on oxidative desulfurization of model diesel

Wan Abu Bakar, Wan Azelee and Ali, Rusmidah and Abdul Kadir, Abdul Aziz and Wan Mokhtar, Wan Nur Aini (2012) Effect of transition metal oxides catalysts on oxidative desulfurization of model diesel. Fuel Processing Technology, 101 . pp. 78-84. ISSN 0378-3820

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Official URL: http://dx.doi.org/10.1016/j.fuproc.2012.04.004

Abstract

In this paper, model diesel is used to study the performance of oxidative desulfurization (ODS) system compared to hydrodesulfurization (HDS) process. A detailed parametric experimental study was performed to select the best technique for sulfur removal. The effects of solvent, oxidant, bimetallic oxide catalyst, dopant, dopant ratio and calcination temperature were investigated. Dimethylformamide (DMF) and tert-butyl hydroperoxide (TBHP) were found to be the best solvent and oxidizing agent for the removal of sulfur compounds in model diesel. Both solvent and oxidant were then applied to explore the applicability of various catalysts, such as iron, manganese, molybdenum, tin, zinc and cobalt in model diesel. The results showed that the catalytic activity was decreased in the order: Mo > Mn > Sn > Fe ˜ Co > Zn. Further investigation of doped molybdenum revealed that 4.35% WO3/16.52% MoO3/Al2O3 in the ratio of 10:90 with calcination temperature at 500 °C was assigned as the best catalyst in this research. Under mild reaction condition, this catalyst showed high conversion with appreciable stability until 150 hours and can be used as a reusable active catalyst in ODS treatment. Additionally, on the basis results obtained, a mechanistic proposal for this reaction was postulated, as an oxidation mechanism by nucleophilic attack of the sulfur atom on peroxo species of WO3/MoO3/Al2O3.

Item Type:Article
Uncontrolled Keywords:Model diesel, Oxidative desulfurization
Subjects:T Technology > TP Chemical technology
Divisions:Science
ID Code:33460
Deposited By: Fazli Masari
Deposited On:28 Aug 2013 04:07
Last Modified:30 Nov 2018 06:35

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